Retirement Plans - Schedule of Pension Plans Contributions (Details) - U.S. Plans [Member] - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 1,000	$ 1,000
Voluntary Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 1,000	$ 1,000

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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-Publisher FASB
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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration